His college tuition was paid by the trust-fund set up by his parents.

trust-fund 是由 trust（信托）和 fund（基金）组成的复合名词。trust 指"信托"，是一种财产管理方式；fund 指"基金"，即专门用途的资金池。 trust-fund 指"信托基金"，是由受托人管理的、为受益人利益而设立的资金或财产。